QwtSlider - Man Page

enum BGSTYLE { BgTrough =  0x1, BgSlot =  0x2, BgBoth =  BgTrough | BgSlot }
enum ScalePos { NoScale, LeftScale, RightScale, TopScale, BottomScale }
enum ScrollMode { ScrNone, ScrMouse, ScrTimer, ScrDirect, ScrPage }

virtual void fitValue (double val)
virtual void incValue (int steps)
virtual void setReadOnly (bool)
virtual void setValue (double val)

void sliderMoved (double value)
void sliderPressed ()
void sliderReleased ()
void valueChanged (double value)

bool autoScale () const
BGSTYLE bgStyle () const
int borderWidth () const
virtual void incPages (int)
bool isReadOnly () const
bool isValid () const
virtual double mass () const
double maxValue () const
virtual QSize minimumSizeHint () const
double minValue () const
Qt::Orientation orientation () const
int pageSize () const
bool periodic () const
QwtSlider (QWidget *parent, Qt::Orientation=Qt::Horizontal, ScalePos=NoScale, BGSTYLE bgStyle=BgTrough)
const QwtScaleDraw * scaleDraw () const
const QwtScaleEngine * scaleEngine () const
QwtScaleEngine * scaleEngine ()
const QwtScaleMap & scaleMap () const
int scaleMaxMajor () const
int scaleMaxMinor () const
ScalePos scalePosition () const
void setAutoScale ()
void setBgStyle (BGSTYLE)
void setBorderWidth (int bw)
void setMargins (int x, int y)
virtual void setMass (double val)
virtual void setOrientation (Qt::Orientation)
void setPeriodic (bool tf)
void setRange (double vmin, double vmax, double vstep=0.0, int pagesize=1)
void setScale (double vmin, double vmax, double step=0.0)
void setScale (const QwtScaleDiv &s)
void setScale (const QwtDoubleInterval &, double step=0.0)
void setScaleDraw (QwtScaleDraw *)
void setScaleEngine (QwtScaleEngine *)
void setScaleMaxMajor (int ticks)
void setScaleMaxMinor (int ticks)
void setScalePosition (ScalePos s)
void setStep (double)
void setThumbLength (int l)
void setThumbWidth (int w)
void setTracking (bool enable)
void setUpdateTime (int t)
void setValid (bool valid)
virtual QSize sizeHint () const
double step () const
void stopMoving ()
int thumbLength () const
int thumbWidth () const
double value () const

const QwtAbstractScaleDraw * abstractScaleDraw () const
QwtAbstractScaleDraw * abstractScaleDraw ()
void draw (QPainter *p, const QRect &update_rect)
virtual void drawSlider (QPainter *p, const QRect &r)
virtual void drawThumb (QPainter *p, const QRect &, int pos)
double exactPrevValue () const
double exactValue () const
virtual void fontChange (const QFont &oldFont)
virtual void getScrollMode (const QPoint &p, int &scrollMode, int &direction)
virtual double getValue (const QPoint &p)
virtual void keyPressEvent (QKeyEvent *e)
void layoutSlider (bool update=true)
virtual void mouseMoveEvent (QMouseEvent *e)
double mouseOffset () const
virtual void mousePressEvent (QMouseEvent *e)
virtual void mouseReleaseEvent (QMouseEvent *e)
virtual void paintEvent (QPaintEvent *e)
double prevValue () const
virtual void rangeChange ()
void rescale (double vmin, double vmax, double step=0.0)
virtual void resizeEvent (QResizeEvent *e)
virtual void scaleChange ()
QwtScaleDraw * scaleDraw ()
int scrollMode () const
void setAbstractScaleDraw (QwtAbstractScaleDraw *)
void setMouseOffset (double)
virtual void setPosition (const QPoint &)
virtual void stepChange ()
virtual void timerEvent (QTimerEvent *e)
virtual void valueChange ()
virtual void wheelEvent (QWheelEvent *e)
int xyPosition (double v) const

See also:

• Qt::Horizonal combines with NoScale, TopScale and BottomScale
• Qt::Vertical combines with NoScale, LeftScale and RightScale

See also:

See also:

Constructor. Parameters:

QwtSlider enforces valid combinations of its orientation and scale position. If the combination is invalid, the scale position will be set to NoScale. Valid combinations are:

• Qt::Horizonal with NoScale, TopScale, or BottomScale;
• Qt::Vertical with NoScale, LeftScale, or RightScale.

See also:

See also:

Draw the QwtSlider.

Parameters:

painter Painter
r Rectangle

Parameters:

painter Painter
sliderRect Bounding rectangle of the slider
pos Position of the slider thumb

Returns the exact previous value.

Returns the exact value. The exact value is the value which QwtDoubleRange::value would return if the value were not adjusted to the step raster. It differs from the current value only if QwtDoubleRange::fitValue or QwtDoubleRange::incValue have been used before. This function is intended for internal use in derived classes.

Set the slider's value to the nearest integer multiple of the step size. Parameters:

See also:

Reimplemented from QwtDoubleRange.

Notify change in font.

Determine scrolling mode and direction. Parameters:

Implements QwtAbstractSlider.

Parameters:

pos Mouse position

Implements QwtAbstractSlider.

Increment the value by a specified number of pages. Parameters:

Warning:

The Page size is specified in the constructor.

Increment the value by a specified number of steps. Parameters:

See also:

Reimplemented from QwtDoubleRange.

Returns:

true if read only

See also:

setReadOnly()

Reimplemented from QwtDoubleRange.

• Key_Down, KeyLeft
  Decrement by 1
• Key_Up, Key_Right
  Increment by 1

Parameters:

e Key event

See also:

isReadOnly()

Reimplemented in QwtCompass, and QwtDial.

Parameters:

update_geometry notify the layout system and call update to redraw the scale

See also:

Reimplemented in QwtWheel.

Returns the value of the second border of the range. maxValue returns the value which has been specified as the second parameter in QwtDoubleRange::setRange.

See also:

Return a minimum size hint. Warning:

Returns the value at the first border of the range. minValue returns the value which has been specified as the first parameter in setRange().

See also:

Parameters:

e Mouse event

Parameters:

e Mouse event

Parameters:

e Mouse event

See also:

Returns the page size in steps.

Parameters:

event Paint event

Returns true if the range is periodic. See also:

Returns the previous value.

Notify change of range.

Reimplemented from QwtDoubleRange.

Parameters:

vmin Lower limit of the scale interval
vmax Upper limit of the scale interval
stepSize Major step size

See also:

scaleChange()

Qt resize event.

Notify changed scale.

Reimplemented from QwtAbstractScale.

See also:

See also:

See also:

See also:

Return the scale position.

Set a scale draw. scaleDraw has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setAbstractScaleDraw.

Advise the widget to control the scale range internally. Autoscaling is on by default.

See also:

Change the slider's border width. Parameters:

Set distances between the widget's border and internals. Parameters:

Set the slider's mass for flywheel effect. If the slider's mass is greater then 0, it will continue to move after the mouse button has been released. Its speed decreases with time at a rate depending on the slider's mass. A large mass means that it will continue to move for a long time.

Derived widgets may overload this function to make it public.

Parameters:

val New mass in kg

See also:

mass()

Reimplemented in QwtWheel.

Set the orientation. Parameters:

If the new orientation and the old scale position are an invalid combination, the scale position will be set to QwtSlider::NoScale.

See also:

Reimplemented from QwtAbstractSlider.

Make the range periodic. When the range is periodic, the value will be set to a point inside the interval such that

point = value + n * width .fi


if the user tries to set a new value which is outside the range. If the range is nonperiodic (the default), values outside the range will be clipped.

Parameters:
  tf true for a periodic range

Specify range and step size. Parameters:

Warning:

• A change of the range changes the value if it lies outside the new range. The current value will *not* be adjusted to the new step raster.
• vmax < vmin is allowed.
• If the step size is left out or set to zero, it will be set to 1/100 of the interval length.
• If the step size has an absurd value, it will be corrected to a better one.

In read only mode the slider can't be controlled by mouse or keyboard.

Parameters:

readOnly Enables in case of true

See also:

isReadOnly()

Specify a scale. Disable autoscaling and define a scale by an interval and a step size

Parameters:

interval Interval
stepSize major step size

See also:

setAutoScale()

Specify a scale. Disable autoscaling and define a scale by an interval and a step size

Parameters:

vmin lower limit of the scale interval
vmax upper limit of the scale interval
stepSize major step size

See also:

setAutoScale()

Specify a scale. Disable autoscaling and define a scale by a scale division

Parameters:

scaleDiv Scale division

See also:

setAutoScale()

Set a scale draw. For changing the labels of the scales, it is necessary to derive from QwtScaleDraw and overload QwtScaleDraw::label().

Parameters:

scaleDraw ScaleDraw object, that has to be created with new and will be deleted in ~QwtSlider or the next call of setScaleDraw().

Set a scale engine. The scale engine is responsible for calculating the scale division, and in case of auto scaling how to align the scale.

scaleEngine has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setScaleEngine.

Set the maximum number of major tick intervals. The scale's major ticks are calculated automatically such that the number of major intervals does not exceed ticks. The default value is 5.

Parameters:

ticks maximal number of major ticks.

See also:

QwtAbstractScaleDraw

Set the maximum number of minor tick intervals. The scale's minor ticks are calculated automatically such that the number of minor intervals does not exceed ticks. The default value is 3.

Parameters:

ticks

See also:

QwtAbstractScaleDraw

Change the scale position (and slider orientation). Parameters:

A valid combination of scale position and orientation is enforced:

• if the new scale position is Left or Right, the scale orientation will become Qt::Vertical;
• if the new scale position is Bottom or Top the scale orientation will become Qt::Horizontal;
• if the new scale position is QwtSlider::NoScale, the scale orientation will not change.

Change the step raster. Parameters:

Warning:

The value will not be adjusted to the new step raster.

Reimplemented in QwtCounter.

Set the slider's thumb length. Parameters:

Change the width of the thumb. Parameters:

Enables or disables tracking. If tracking is enabled, the slider emits a valueChanged() signal whenever its value changes (the default behaviour). If tracking is disabled, the value changed() signal will only be emitted if:

• the user releases the mouse button and the value has changed or
• at the end of automatic scrolling.

Tracking is enabled by default.

Parameters:

enable true (enable) or false (disable) tracking.

Specify the update interval for automatic scrolling. Parameters:

See also:

See also:

Reimplemented from QwtDoubleRange.

Move the slider to a specified value. This function can be used to move the slider to a value which is not an integer multiple of the step size.

Parameters:

val new value

See also:

fitValue()

Reimplemented from QwtDoubleRange.

Parameters:

value new value

See also:

Reimplemented in QwtCounter.

Notify a change of the step size. This virtual function is called whenever the step size changes. The default implementation does nothing.

Stop updating if automatic scrolling is active.

Parameters:

e Timer event

Returns the current value.

Reimplemented in QwtCounter.

Notify change of value.

Reimplemented from QwtAbstractSlider.

Notify a change of value. In the default setting (tracking enabled), this signal will be emitted every time the value changes ( see setTracking() ).

Parameters:

value new value

Parameters:

e Whell event

Parameters:

value Value